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    <h1>
      <a href="../../index.html">all files</a> / <a href="index.html">src/scroll/</a> zoom.js
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        <span class="strong">7.79% </span>
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        <span class="strong">14.29% </span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { eventType, style, offsetToBody } from '../util/dom'
import { getDistance } from '../util/lang'
&nbsp;
export function zoomMixin(BScroll) {
  BScroll.prototype._initZoom = function () <span class="fstat-no" title="function not covered" >{</span>
    const {start = 1, min = 1, max = 4} = <span class="cstat-no" title="statement not covered" >this.options.zoom</span>
<span class="cstat-no" title="statement not covered" >    this.scale = Math.min(Math.max(start, min), max)</span>
<span class="cstat-no" title="statement not covered" >    this.setScale(this.scale)</span>
<span class="cstat-no" title="statement not covered" >    this.scrollerStyle[style.transformOrigin] = '0 0'</span>
  }
&nbsp;
  BScroll.prototype._zoomTo = function (scale, originX, originY, startScale) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    this.scaled = true</span>
&nbsp;
    const lastScale = <span class="cstat-no" title="statement not covered" >scale / (startScale || this.scale)</span>
<span class="cstat-no" title="statement not covered" >    this.setScale(scale)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.refresh()</span>
&nbsp;
    let newX = <span class="cstat-no" title="statement not covered" >Math.round(this.startX - (originX - this.relativeX) * (lastScale - 1))</span>
    let newY = <span class="cstat-no" title="statement not covered" >Math.round(this.startY - (originY - this.relativeY) * (lastScale - 1))</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (newX &gt; this.minScrollX) {</span>
<span class="cstat-no" title="statement not covered" >      newX = this.minScrollX</span>
    } else <span class="cstat-no" title="statement not covered" >if (newX &lt; this.maxScrollX) {</span>
<span class="cstat-no" title="statement not covered" >      newX = this.maxScrollX</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (newY &gt; this.minScrollY) {</span>
<span class="cstat-no" title="statement not covered" >      newY = this.minScrollY</span>
    } else <span class="cstat-no" title="statement not covered" >if (newY &lt; this.maxScrollY) {</span>
<span class="cstat-no" title="statement not covered" >      newY = this.maxScrollY</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.x !== newX || this.y !== newY) {</span>
<span class="cstat-no" title="statement not covered" >      this.scrollTo(newX, newY, this.options.bounceTime)</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.scaled = false</span>
  }
&nbsp;
  BScroll.prototype.zoomTo = function (scale, x, y) <span class="fstat-no" title="function not covered" >{</span>
    let {left, top} = <span class="cstat-no" title="statement not covered" >offsetToBody(this.wrapper)</span>
    let originX = <span class="cstat-no" title="statement not covered" >x + left - this.x</span>
    let originY = <span class="cstat-no" title="statement not covered" >y + top - this.y</span>
<span class="cstat-no" title="statement not covered" >    this._zoomTo(scale, originX, originY)</span>
  }
&nbsp;
  BScroll.prototype._zoomStart = function (e) <span class="fstat-no" title="function not covered" >{</span>
    const firstFinger = <span class="cstat-no" title="statement not covered" >e.touches[0]</span>
    const secondFinger = <span class="cstat-no" title="statement not covered" >e.touches[1]</span>
    const deltaX = <span class="cstat-no" title="statement not covered" >Math.abs(firstFinger.pageX - secondFinger.pageX)</span>
    const deltaY = <span class="cstat-no" title="statement not covered" >Math.abs(firstFinger.pageY - secondFinger.pageY)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.startDistance = getDistance(deltaX, deltaY)</span>
<span class="cstat-no" title="statement not covered" >    this.startScale = this.scale</span>
&nbsp;
    let {left, top} = <span class="cstat-no" title="statement not covered" >offsetToBody(this.wrapper)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.originX = Math.abs(firstFinger.pageX + secondFinger.pageX) / 2 + left - this.x</span>
<span class="cstat-no" title="statement not covered" >    this.originY = Math.abs(firstFinger.pageY + secondFinger.pageY) / 2 + top - this.y</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.trigger('zoomStart')</span>
  }
&nbsp;
  BScroll.prototype._zoom = function (e) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    if (!this.enabled || this.destroyed || eventType[e.type] !== this.initiated) {</span>
<span class="cstat-no" title="statement not covered" >      return</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.options.preventDefault) {</span>
<span class="cstat-no" title="statement not covered" >      e.preventDefault()</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.options.stopPropagation) {</span>
<span class="cstat-no" title="statement not covered" >      e.stopPropagation()</span>
    }
&nbsp;
    const firstFinger = <span class="cstat-no" title="statement not covered" >e.touches[0]</span>
    const secondFinger = <span class="cstat-no" title="statement not covered" >e.touches[1]</span>
    const deltaX = <span class="cstat-no" title="statement not covered" >Math.abs(firstFinger.pageX - secondFinger.pageX)</span>
    const deltaY = <span class="cstat-no" title="statement not covered" >Math.abs(firstFinger.pageY - secondFinger.pageY)</span>
    const distance = <span class="cstat-no" title="statement not covered" >getDistance(deltaX, deltaY)</span>
    let scale = <span class="cstat-no" title="statement not covered" >distance / this.startDistance * this.startScale</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.scaled = true</span>
&nbsp;
    const {min = 1, max = 4} = <span class="cstat-no" title="statement not covered" >this.options.zoom</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (scale &lt; min) {</span>
<span class="cstat-no" title="statement not covered" >      scale = 0.5 * min * Math.pow(2.0, scale / min)</span>
    } else <span class="cstat-no" title="statement not covered" >if (scale &gt; max) {</span>
<span class="cstat-no" title="statement not covered" >      scale = 2.0 * max * Math.pow(0.5, max / scale)</span>
    }
&nbsp;
    const lastScale = <span class="cstat-no" title="statement not covered" >scale / this.startScale</span>
&nbsp;
    const x = <span class="cstat-no" title="statement not covered" >this.startX - (this.originX - this.relativeX) * (lastScale - 1)</span>
    const y = <span class="cstat-no" title="statement not covered" >this.startY - (this.originY - this.relativeY) * (lastScale - 1)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.setScale(scale)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.scrollTo(x, y, 0)</span>
  }
&nbsp;
  BScroll.prototype._zoomEnd = function (e) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    if (!this.enabled || this.destroyed || eventType[e.type] !== this.initiated) {</span>
<span class="cstat-no" title="statement not covered" >      return</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.options.preventDefault) {</span>
<span class="cstat-no" title="statement not covered" >      e.preventDefault()</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.options.stopPropagation) {</span>
<span class="cstat-no" title="statement not covered" >      e.stopPropagation()</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.isInTransition = false</span>
<span class="cstat-no" title="statement not covered" >    this.isAnimating = false</span>
<span class="cstat-no" title="statement not covered" >    this.initiated = 0</span>
&nbsp;
    const {min = 1, max = 4} = <span class="cstat-no" title="statement not covered" >this.options.zoom</span>
&nbsp;
    const scale = <span class="cstat-no" title="statement not covered" >this.scale &gt; max ? max : this.scale &lt; min ? min : this.scale</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this._zoomTo(scale, this.originX, this.originY, this.startScale)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.trigger('zoomEnd')</span>
  }
}
&nbsp;</pre></td></tr>
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